I guess that is a reasonable test if the wind never blows while it is raining. My experience is, that is not always true. I thought that might only be a Florida problem but I got caught in a little squall in South Dakota a couple weeks ago that was as nasty as our storms, (wind and water) just no lightning to speak of.
To the semi-trained eye I would say it was gusting 50 or so, dropped a half inch of rain in about 15 minutes and pea sized hail.
